Exam 2Name:

CHM 1025

Summer 2010

MC: pick the best answer (1.5 pt each, total 52.5 pts)

  1. Which of the following is true of subatomic particles?
  2. Electrons have a negative charge, protons are neutral and neutrons are positive
  3. Electrons have a negative charge, protons are positive and neutrons are neutral
  4. Electrons have a positive charge, protons are negative and neutrons are neutral
  5. Electrons have a positive charge, protons are neutral and neutrons are negative
  1. Where would you find an electron in an atom?
  2. Outside the nucleus
  3. Inside the nucleus
  4. We don’t know
  1. Which of the following has the least mass?
  2. A proton
  3. An electron
  4. A nucleus
  1. Which takes up less space in an atom?
  2. The nucleus
  3. The electron cloud
  1. How many protons does calcium have?
  2. 40
  3. 20
  4. 40.08
  1. How many electrons does oxygen have?
  2. 8
  3. 16
  4. 15.9994
  1. How many neutrons does selenium have?
  2. 34
  3. 45
  4. 79
  1. How many electrons does a potassium ion have, K+?
  2. 19
  3. 20
  4. 18
  1. Is the periodic table listed by atomic # or atomic mass?
  2. Atomic mass
  3. Atomic #
  1. Which of the following is true of isotopes?
  2. They are atoms that have the same number of protons and neutrons, but different number of electrons
  3. They are atoms that have the same number of electrons and neutrons, but different number of protons
  4. They are atoms that have the same number of protons and electrons, but different number of neutrons
  1. Which type of electrons are responsible for the reactivity of an atom?
  2. Valence
  3. Core
  1. An orbital is the region where there is a high probability of finding an electron, what does an s orbital look like?
  2. A bow-tie
  3. A sphere
  4. A 4-leaf clover
  1. What is the atomic number of rhodium?
  2. 103
  3. 102.91
  4. 45
  1. What is the atomic mass of barium?
  2. 137.34 amu
  3. 56 amu
  4. 81.34 amu
  1. What is the mass number for argon?
  2. 39.95
  3. 40
  4. 18
  1. How many electrons can go into a d orbital?
  2. 2
  3. 10
  4. 14
  1. How many valence electrons does nitrogen have?
  2. 5
  3. 7
  4. 14
  1. Which of the following is the correct electron dot formula for chlorine?
  1. A column in the periodic table is called a…
  2. Group
  3. Period
  4. Element
  5. Isotope
  1. Magnesium belongs to which of the following groups?
  2. Halogens
  3. Noble gases
  4. Alkali metals
  5. Alkaline earth metals
  1. Brominebelongs to which of the following groups?
  2. Halogens
  3. Noble gases
  4. Alkali metals
  5. Alkaline earth metals
  1. Cesium belongs to which of the following groups?
  2. Halogens
  3. Noble gases
  4. Alkali metals
  5. Alkaline earth metals
  1. Which of the following is not an inner transition metal?
  2. Ce
  3. Am
  4. Er
  5. Sr
  1. Which of the following has the smallest atomic radius?
  2. Cs
  3. K
  4. Cl
  5. F
  1. Which of the following has the largest atomic radius?
  2. Mg
  3. Mg2+
  1. Which of the following is less electronegative?
  2. Cl
  3. Pd
  4. Rb
  1. Which of the following has the lowest ionization energy?
  2. F
  3. Cl
  4. Br
  1. Which of the following has the highest ionization energy?
  2. Mg2+
  3. Mg
  1. Which of the following has the greatest electron affinity?
  2. Ar
  3. Rb
  4. F
  1. Which of the following has the least metallic character?
  2. Cl
  3. Br
  4. I
  1. Which of the following has the least metallic character?
  2. Ba
  3. Sr
  4. Ca
  1. Which of the following is a cation?
  2. Cl-
  3. Cl
  4. Na
  5. Na+
  1. In the following reaction, what are the product (s)?

H2O  H2 + O2

  1. H2 and O2
  2. H2O
  1. In the following reaction, what is the catalyst?
  1. A + B
  2. Cr
  3. C
  1. Which of the following is not a diatomic molecule?
  2. Oxygen
  3. Nitrogen
  4. Carbon
  5. Bromine

LA 1: Fill in the table, ground state electron configuration (circle the valence electrons) and draw the electron diagram (9pts)

Element or ion / Electron Configuration (Circle Valence electrons)
Cl
Cl-
Mg+2

LA 2: Name or draw the following chemical formulas by filling in the table (20 pts)

Chemical formula / Chemical Name
BF3
Cr(OH)4
Sr3PO4
P5O4
Cs2S
Zinc perchlorate
Aluminum nitride
Sulfur hexabromide
Lithium borate
Dicarbon tetrahydride

LA 3: List 3 observations that tell you a chemical reaction has occurred (6.5 pts)

a)

b)

c)

LA 4: Write the balanced reaction for the following, then state what type of reaction it is. All of these are successful reactions (12 pts)

  1. V(HCO3)4(s) 

Type:

  1. Li(s) + P(s) 

Type:

  1. K(s) + MgBr2(aq) 

Type:

  1. ZnBr2(aq) + AgNO3(aq) 

Type:

1